import axios from 'axios'
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import authUtil from '@/utils/auth'
import qs from 'qs';

// 创建异步请求实例
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 50000 // 超时时间
})

// 请求前拦截
service.interceptors.request.use(
  config => {
    if (store.getters.token) {
      // 从store中获取token放到头部信息中
      config.headers['token'] = authUtil.getToken()
    }
    return config
  },
  error => {
    return Promise.reject(error)
  }
)

// 响应时拦截
service.interceptors.response.use(
  response => {
    const res = response.data

    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 20000) {
      Message({
        message: res.message || '请求响应异常',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 48003 || res.code === 48004 || res.code === 48003) {
        // to re-login
        MessageBox.confirm('权限认证过期，请重新登录', '系统提示', {
          confirmButtonText: '登录',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.message || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)
const http={
  // POST请求
  post(url,params){
    return service.post(url,params,{
      transformRequest: [(params)=> {
        return JSON.stringify(params);
      }],
      headers:{
        'Content-type':'application/json'
      }
    })
  },
  // PUT 请求
  put(url,params){
    return service.put(url,params,{
      transformRequest: [(params)=> {
        return JSON.stringify(params);
      }],
      headers:{
        'Content-type':'application/json'
      }
    })
  },
  // GET REST 请求
  getRest(url,params){
    let _params;
    if (Object.is(params,undefined || null || '')){
      _params = '';
    }else {
      _params="/";
      for (const key in params){
        console.log("请求参数key={},value={}",key,params[key])
        if (params.hasOwnProperty(key) && params[key] !== null && params[key] !== ''){
          _params+=`${params[key]}/`
        }
      }
      _params = _params.substring(0,_params.length-1)
    }
    if (_params){
      return service.delete(`${url}${_params}`).catch(err=>{
        message.error(err.message);
        return Promise.reject(err);
      })
    }else {
      return service.delete(`${url}`).catch(err => {
        message.error(err.message);
        return Promise.reject(err);
      })
    }
  },
  // GET 请求
  get(url,params){
    return service.get(url,{
      params: params,
      paramsSerializer: (params) =>{
        return qs.stringify(params)
      }
    })
  },
  // DELETE 请求
  delete(url,params){
    let _params;
    if (Object.is(params,undefined || null || '')){
      _params = '';
    }else {
      _params="/";
      for (const key in params){
        console.log("请求参数key={},value={}",key,params[key])
        if (params.hasOwnProperty(key) && params[key] !== null && params[key] !== ''){
          _params+=`${params[key]}/`
        }
      }
      _params = _params.substring(0,_params.length-1)
    }
    if (_params){
      return service.get(`${url}${_params}`)
    }else {
      return service.get(`${url}`)
    }
  },
  // 文件上传
  upload(url,params){
    return service.post(url,params, {
      headers: {
        'Content-type': 'application/json'
      }
    })
  },
  // 登录请求
  login(url,params){
    let _params = "?"+qs.stringify(params)
    url+=_params
    return service.post(url,null,{
      headers:{
        'Content-type':'x-www-form-urlencoded'
      }
    })
  }

}

export default http;
